Diamond-polishing apparatus.



0.1. COLEMAN. DIAMOND' POLISHING APPARATUS.

APPLICATION FILED DEC. 20, 1912.

1,168,71 1. I Patented Jan. 18, 1916.

3 SHEETS-SHEET lo o Z5 'rx-lB COLUMBIA PLMNOGRAPH co., WASHINGTON, n. c.

CAJACOLEMAN. DIAMOND POLISHING APPARATUS.

APPLICATION FILED DEC: 20 I I912. v 1 168,7,1'1, I Patented Jan. 18, 1916.

3 SHEETS-SHEET 2.

I 7 211 mm: 66 3mm 5,2 A AW THE COLUMBIA PumcuRAPl-l Cm, WASHINGTON. D. c.

C. J. COLEMAN. r DIAMOND POLISHING APPARATUS. v APPLICATION FILED DEC 20,1912. v 1,168,71 1. Patented Jan. 18, 1916.-

3 SHEETS-SHEET 3- W/TNESSES: INVENTOR A TTORN E Y THE COLUMBIA PLANOflRAPl-l 60., WASHINGTON, D c.

unrrnn s rarns ra rnn'r oirrron.

CLYDE J. COLEMAN, OF NEW ROCHELLE, NEW YORK, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO STERN-COLEMAN DIAMOND MAG INT-i COMPANY, INC., A. CORPORATION OF NEW YORK.

DIAMOND-POLISI-ZIIIG nrrana'rns.

Patented Jan. 18,1916.

Application filed Eecemher 20, 112. Serial No. 737,782.

To all whom it may concern Be it known that L-ICLYDE J. COLEMAN,

a citizen of the United States, residing at New Rochelle, in the county of Westchester and State of New York, have invented certain new and useful improvements in Dia mond-Polishing Apparatus, of which. the

following is a specification, reference being had therein to the accompanying drawings, forming part thereof.

My invention relates to the art of polishing diamonds and. other gems and particularly to -means for attaching gems to hold ing arbors preparatory to polishing the gems. My i vention may be carried out either in transferring bruted gems from a holding member to an arbor,-0r in transferring gems from one arbor to another as shown and described in my co-pending application Serial Number 7 33,420, filed November 25, 1912, and in my co-pending application Serial Number 733,421, filed November 25, 1912. In the first instance, the bruted gem is held: in a suitable chuck and inserted in the cement-containing socket of the arbor, and in the second instance, after the facets on the exposed portion of the gem on one side of the girdle have been polished, the gem is transferred to'asecond arbor with the unpolished portion of the gem exposed, the projecting portion of the gem being inserted in the cement-containing socket of the second arbor, and, after it is secured there, the first arbor is broken off. In both instances it is essential that the gem be arranged in axial alinement with the receiving arbor, and means are shown and described in my said applications for efiecting this arrangement.

An object of my invention is to provide simple and reliable means for effectively securing'the gems to the arbors.

Another object is to provide a device which will be automatic in itsoperation. Other objects are facility and convenience of operation, and compactness and durability of construction.

Still other objects and advantages of my invention will appear from the following description.

In carrying out my invention in one form, I provide means for effecting the insertion of the gem into the cement-containing socket of the arbor, and for then subjecting it to .trol the intensity of the current.

heat which is gradually increased in intensity until the cement is baked. Preferably, also, the heat is afterward gradually diminished in intensity until the cement is again cooled off.

More particularly, as a means'for carrying out my invention, I'provide a source of heat adjacent to the cement-containing socket of the arbor, and heat-regulating means which are automatically controlled and which will gradually turn on the heat until the maximum is reached, and which will preferably afterward gradually turn it off. electric furnace and a switch device is provided in the circuit which will automatically be opened at a predetermined time. Also there are preferably provided current-regulating means arranged to automatically con- Specifically there is a source of alternating current for the circuit, and the current-regulating means include a choke coil and an adjustable core therefor, together with means for automatically withdrawing and inserting the core;

My invention also comprehends various other features, and various details of construction and arrangements and combinations of parts, as will hereinafter more fully appear. p

I shall now describe the embodiment of my invention illustrated in the accompanying drawings, and shall thereafter point out my invention in .claims.

Figure l is a side elevation, partly in section, of a complete device embodying my invention, with the electric circuit shown diagrammatically. Fig. 2 is a rear elevation, partly in section, of the same, the circuit being shown diagrammatically. Fig. 3 is a detail in side elevation, on a reducedscale, of the support and immediate parts, showing the gas receptacle in position to receive the arbor-holding device. Fig. 4c is a detail in side elevation, of the arbor-holding de vice and parts carried thereby, secured to its temporary support. Fig. 5 is a horizontal section of the same, on line 55 of Fig. 4:, looking down.

In theillustrated embodiment of my invention I employ, as an arbor-holding device, two arbor holders 1 and 2 slidably mounted 111 a V-shape gulde groove on a guide support 3. The arbor holders are cy- Preferably the source of heat is an lindrical and have a concentric arbor-holding extension of reduced diameter provided with a tapered bore (not shown) for the re ception of the arbors, all as shown and de scribed in my said application Serial Number 733,at21, filed November 25, 1912. The arbor holder 1 holds the holding arbor 4L from which the gem is to be transferred, and the arbor holder 2 holds the receiving arbor 5 to which the gem is to be transferred. Each arbor is provided with an arbor-displacing screw 6, which extends axially through the arbor holder and is arranged to abut against the inner end of the arbor and loosen the arbor as the displacing screw is manually turned. To hold the arbor holders in the V-shape groove of the guide support 3, while permitting movement longitudinally of the guide groove, resilient tension strap 7 of general U-shape, one-half of which appears in Fig. 4, are provided which embrace the arbor holders and have their ends turned inward to engage in grooves in the rear edges of the guide support 3. These tension straps are tightened against the arbor holders by thumb screws 8.

The arbor holders 1 and 2 are arranged with the socket ends of the arbor adjacent as shown and with the arbors in axial alinement, and this axial alinement is maintained as the arbors are made to approach and recede from each other. It is, therefore, apparent that, since the gem was originally arranged in axial alinement with the holding arbor 4, it is also in axial alinement with the receiving arbor 5, and as the two arbors are brought together, the projecting portion of the gem on which the facets have been polished will enter the socket in the end of the receiving arbor 5, which socket has previously been filled with suitable cement.

The guide support 3 is secured on end by bolts 9 to a disk-shaped support 10, which is carried upon a flat base 11, and underneath the base 11 is secured a plunger-operating member 12, the function of which will appear hereinafter.

To bake the cement and thus fasten the polished end of the gem in the socket of the receivin arbor 5, a small electric furnace 13 is provided also slidably mounted upon the guide support 3, and a flat tension spring 1 1 is secured at one end on the tension strap 7 about the arbor holder 1 by the thumb screw 3 and a lock nut 15, and bears with its other end on the top of the electric furnace and holds the electric furnace in the guide groove while permitting it to be adjusted longitudinally of the guide groove. The hollow interior of the electric furnace 13 is disposed in line with the arbors 4 and 5, so that the abutting ends of the arbors are adapted to enter the electric furnace, as shown in Fig. 4:.

The lead wires 16 and 17 of the electric furnace 13 connect with two projecting terminals 18 and 19, respectively, which are carried by the base 11. In adjusting the parts and inserting a gem into the receiving arbor ready for baking the cement, the arbor-holding device is secured to a temporary support 20 which may be either a work bench or a special block provided for the purpose. This temporary support 20 has two bores or openings 21 and 22 for the reception of the projecting terminals 18 and 19, and these terminals, therefore, serve as supports for the arb0r-holding device, while the parts are being adjusted for the baking operation.

After the parts have been adjusted to the position shown in Fig. 4, the arbor-holding device is bodily removed from the tempo rary support 21 and inserted from below upward into an open bottomed dome or hell 23, which serves as a receptacle for some suitable non-oxidizing atmosphere such as hydrogen or illuminating gas, the bottom support 10 fitting into the bottom of the dome 23. This gas enters the top of the dome 23 through a tube 2% controlled by a stop cook 25. This dome 23 is secured to a vertical upright or standard 26 by a lazy tongs construction 27 and is therefore adjustable laterally relative to the upright 26. For the support of the arbor-holding device, two brackets 28 and 29 are provided on the support 26 underneath the dome 23 and the arbor-holding device is arranged to rest with the base 11 upon the two brackets and with the plun er-operating member 12 extending down between the two brackets.

After the parts are properly adjusted, the arbor-holding device is inserted into the dome 23, this being withdrawn to the position shown in Fig. 3 clear of the supporting brackets 28 and 29, and then the arbor-hold ing device and the dome are moved inwardly together until the arbor-holding device rests properly upon the brackets in the position shown in Fig. 1. In this position the two terminals 18 and 19 engage and make con tact with two stationary spring contacts 30 and 31, respectively, on the standard 26, and

at the same time the plunger-operating member 12 engages a spring-pressed plunger 32 in the standard and forces it inwardly to operate a switch device, as will now be described, a stop pin, as appears in Fig. 1, being provided to limit the movement of the plunger under the influence of the spring.

Secured to the standard 26 by a supporting arm 33 is a bearing 3% for a rotative shaft 35. This shaft 35 forms a continuation of and is arranged in alinement with another shaft 36. The shaft 36 bears in a suitable support 37 carried by the supporting arm 33, and to couple the shafts 35 and 36 together at their adjacent ends, when dememberis attracted and the two shafts are coupled together in the well known way. The shaft is rotated by a power device, shown as an electric motor 40, which is operatively connected to the shaft 36 through a suitable reducing gearing. The magnetic clutch andthe electric furnace 13 are connected in series in an electric circuit, which is fed with alternating current from the secondary of a transformer 41, and this circuit is closed by the operation of the plunger 32 and is automatically opened at a predetermined time by the rotation of the shaft 35 as will now appear. Also supported upon another supporting arm 42 projecting out from the standard 26 is a stud 43 arranged above and parallel with the shaft 35. A collar 44 is secured at one endabout the stud 43 and upon the opposite end is rotatably mounted the hub of a weighted lever arm 45. Between the collar 44 and the hub of the weighted lever arm 45 is loosely mounted a hub of a sector 46. This sector 46 is pro-- vided with two angularly spaced stop pins 47, which serve to limit the rotation of the lever arm 45 relative to the sector 46. The hub of the sector '46 carries a movable spring contact member 48 co perative with a stationary spring contact member 49 secured to the standard 26 and the parts are so designed that the movable contact member 48 engages and makes contact with its coo'perative contact 49 when the weighted lever arm 45 is rotated away from the standard 26 in the position shown in Figs. 1 and 2, and breaks contact therewith when the parts are in the opposite position as shown in Fig. 3.

Upon a stud 50 projecting from the side of the lever arm 45 is loosely pivoted a weighted bell crank lever 51, the unweighted arm of which is provided with an abutment finger projecting at right angles therefrom, in the path of a spring member 53 carried by a collar 54 fixed on the outer end of the shaft Theparts are so designed that when the weighted lever arm 45 is raised to open the switch device, as shown in Fig. 3, the weighted bell crank swings around so that the hub on the free end of the bell crank lever rests against the end of the plunger 32, as shown in Fig. 3. Before this position is reached, the lever arm 45 strikes the advance pin 4'? and rotates the sector 46 during the remainder of its rotative movement sun cientlv to open the switch. VJhen the }')lll119,9l 32 is forced inwardly against the tension of its spring by the plunger operating member 12 as the arbor-holding device is placed upon the bracketsgsufficient momentum is imparted to the weighted lever arm 45 to carry it over the center and it falls by gravity to the position shown in Figs. 1 and 2 and engages the rear pin 47 on the sector 46 and carries the sector with it until the switch is closed by the engagetion in the connection between the motor 40 and the shaft 36, and as the shaft 35 rotates, it carries with it the spring 53'. This spring is flexible and is provided at its upper end with a double curve, as shown. With the parts in the position shown in Figs. 1 and 2, the abutment stud or finger 52 is in the path of the spring 53, and, as the spring is rotated counterclockwise, as appears in Fig. 1, it engages the stud 52 and carries it and the weighted lever arm 45 on with it, until the lever arm gets over the center. At that time the stud 02 has ridden from the lower to the upper curve in the spring 53, and the end of the spring is so shaped that the stud is free to escape therefrom as the weightedlever arm 45 is carried on by grav ity and the switch opened, as above described. The end of the spring 53 then resumes its normal position and its upper end hends'down out of the path of the stud 52 when the stud shall be moved back by the plunger 32. Thus the operation of the switch device is entirely automatic. The circuit is closed as the arbor-holding device is placed on its supporting brackets, and the operation of the device is thereby initiated, and the operation is stopped at the predetermined time by the automatic opening of the switch.

To secure the best results in the baking of the cement, I have found that it is desirable that the heat be turned on gradually until the maximum is reached and the cement is baked, and that it be then preferably turned off gradually again and the cement be allowed to cool slowly. To effect this, I provide a current-regulating device arranged to automatically control the intensity of the current through theelectric furnace. This is shown as a choke coil .55 in the circuit and an adjustable core 56 therefor, which has a crank connection with the collar 54 fixed on the end of the shaft 35. As the shaft 35 and collar 54 are rotated, this core 56 is gradually withdrawn from the coil 55 and the intensity of the current is thus grad ually increased until the maximum is reached when the core is entirely with drawn. The current is again gradually reduced in intensity as the core is again inserted and the cement is thus caused to gradually cool off.

The electric circuit for the device is as follows: From one terminal of the secondary oi? the transformer through Wire 57, brush 58, rotary contact 59, coils of the magnet member 38 of the magnetic clutch, rotary contact (50, brush 61, wire 62, stationary spring contact 31, terminal 19, Wire 17, the coil of the electric furnace 13, Wire 16, terminal 1S, stationary spring contact 30, Wire (33, stationary contact 49, movable contact L8, Wire 64, choke coil 55, and Wire (55 back to the secondary of the transformer.

It is obvious that various modifications may be made in the construction shown and above particularly described Within the principle and scope of my invention as delined in the appended claims.

I claim:

1. The combination of a gem-holding arbor having a cement-containing socket for the gem, means for inserting the gem in the cement-containing socket of the arbor, means for subjecting the cement-containing socket to heat, and means for gradually increasing the intensity of the heat until the maximum is reached and the cement is baked.

2. The combination 01 a gem-holding arbor having a cement-containing socket for the gem, means for inserting the gem in the cement-containing socket of the arbor, means for subjecting the cement-containing socket to heat, and means for gradually increasing the intensity of the heat until the maximum is reached and the cement is baked, and then gradually diminishing the heat until the cement has cooled.

3. The combination of a gem holder having a cement-containing socket for the gem, a source of heat for baking the cement, and heat-regulating means operative to cause the intensity of the heat to gradually increase in the baking operation.

4t. The combination of a gem holder hav ing a cementcontaining socket for the gem, a source of heat for baking the cement, and heat-regulating means operative to cause the intensity of the heat to gradually decrease during the latter part of the baking opera tion.

5. The combination of a gem holder having a cement-containing socket for the gem, a source of heat for baking the cement, and heat-regulating means operative to cause the intensity of the heat to gradually increase in the baking operation, and then to decrease during the latter part of the baking operation.

6. The combination of a gem holder having a cement-containing socket for the gem, means for heating the cement to bake the gem therein, and means for automatically eliminating the heat at a predetermined point in the baking operation.

7. The combination of a gem holder having a cement-containing socket for the gem,

a source of heat for baking the cement, heatregulating means operative to cause the intensity of the heat to gradually increase in the baking operation, and means for automatically eliminating the heat at a predetermined point in the baking operation.

8. The combination of a gem holder having a cement-containing socket for the gem, a source of heat for baking the cement, heatregulating means operative to cause the intensity of the heat to gradually decrease during the latter part of the baking operation, and means for automatically eliminating the heat at a predetermined point in the baking operation.

9. Means for attaching gems to arbors comprising an arbor-holding device adapted to hold a gem in the cement-containing socket of the arbor, a source of heat adjacent to the socket sufficient to bake the cement, and heat-regulating means operative to cause the heat to increase gradually to the maximum.

10. Means for attaching gems to arbors comprising an arbor-holding device adapted to hold a gem in the cement-containing socket of the arbor, a source of heat adjacent to the socket sutlicicnt to bake the ce ment, and heat-regulating means operative to cause the heat to increase gradually to the maximum and then to diminish gradually.

11. The combination of a gem holder having a cement-containing socket for the gem, a source of heat for baking the cement, heatregulating means operative to cause the intensity of the heat to gradually increase in the baking operation and then to decrease during the latter part of the baking operation, and means for automatically eliminating the heat at a predetermined point in the baking operation.

12. The combination of a gem holder hav-. ing a cement-containing socket for the gem, means for baking the cement to secure the gem to the holder, and means for automatically substantially stopping the baking op eration.

13. The combination of a gem holder having a cemontcontaining socket for the gem, means for heating the cement to bake the gem therein, a support and means whereby a relative movement of the gem holder and heating means with respect to the support causes he heating means to be thrown into operation to bake the cement.

14. The combination of a gem holder having a cement-containing socket for the gem, means for heating the cement to bake the gem therein, a. container adapted to inclose the gem holder and heating means in a nonoxidizing atmosphere, a support, and means whereby movement or the container with respect to the support causes the heating means to be thrown into operation to bake the cement.

15. The combination of a gem holder having a cement-containing socket for the gem, means for heating the cement to bake the gem therein, a support, means whereby a relative movement of the gem holder and heating means with respect to the support causes the heating means to be thrown into operation to bake the cement, and means for automatically eliminating the heat at a predetermined point in the baking operation.

16. The combination of a gem holder hav ing a cement-containing socket for the gem,

means for heating the cement to bake the gem therein, a support, means whereby a relative movement of the gem holder and heating means with respect to the support causes the heating means to be thrown into operation to bake the cement, and means for automatically regulating said heating means to cause the intensity of the heat to gradually increase in the baking operation.

17. The combination of a gem holder having a cement-containing socket for the gem, means for heating the cement to bake the gem therein, a support, means whereby a relative movement of the gem holder and heating means with respect to the support causes the heating means to be thrown into operation to bake the cement, and means for automatically regulating said heating means to cause the intensity of the heat to gradually decrease during the latter Part of the heating operation.

18. The combination of a gem holder having a cement-containing socket for the gem, means for heating the cement to bake the gem therein, a support, means whereby a relative movement of the gem holder and heating means with respect to the support causes the heating means to be thrown into operation to bake the cement, means for automatically regulating said heating means to cause the intensity of the heat to gradually increase in the baking operation and then to decrease during the latter part of the baking operation, and means for automatically eliminating the heat at a predetermined point in the baking operation.

In testimony whereof I have aflixed my signature in presence of two witnesses.

CLYDE J. COLEMAN. l/Vitnesses L. A. STERNE, EDWIN Snenn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G." 

